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Diffstat (limited to 'examples/cxx/parser/multiroot/driver.cxx')
| -rw-r--r-- | examples/cxx/parser/multiroot/driver.cxx | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/examples/cxx/parser/multiroot/driver.cxx b/examples/cxx/parser/multiroot/driver.cxx new file mode 100644 index 0000000..32aced2 --- /dev/null +++ b/examples/cxx/parser/multiroot/driver.cxx @@ -0,0 +1,245 @@ +// file : examples/cxx/parser/multiroot/driver.cxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : not copyrighted - public domain + +#include <memory> // std::auto_ptr +#include <iostream> + +#include "protocol.hxx" +#include "protocol-pskel.hxx" // Get the configuration macros (XSDE_*). + +#if defined(XSDE_REUSE_STYLE_MIXIN) +# include "protocol-pimpl-mixin.hxx" +#elif defined(XSDE_REUSE_STYLE_TIEIN) +# include "protocol-pimpl-tiein.hxx" +#else +# error this example requires mixin or tiein parser reuse support +#endif + +using std::cerr; +using std::endl; +using xml_schema::ro_string; + +namespace protocol +{ + // We are going to use our own "type ids" for the request + // types. You could instead use dynamic_cast if your system + // provides RTTI. + // + enum request_type + { + unknown_type, + balance_type, + withdraw_type + }; + + // Customize the xml_schema::document_pimpl object to handle our protocol + // vocabulary with multiple root elements. + // + class document_pimpl: public xml_schema::document_pimpl + { + public: + document_pimpl (balance_pskel& balance_p, withdraw_pskel& withdraw_p) + : result_type_ (unknown_type), + balance_p_ (balance_p), + withdraw_p_ (withdraw_p) + { + } + + request_type + result_type () const + { + return result_type_; + } + + request* + result () + { + return result_.release (); + } + + protected: + // This function is called to obtain the root element type parser. + // If the returned pointed is 0 then the whole document content + // is ignored. Note that the signature of this function varies + // depending on whether the runtime was built with polymorphism + // support. + // + virtual xml_schema::parser_base* +#ifndef XSDE_POLYMORPHIC + start_root_element (const ro_string& ns, + const ro_string& name) +#else + start_root_element (const ro_string& ns, + const ro_string& name, + const char* /* xsi:type */) +#endif + { + if (ns == "http://www.codesynthesis.com/protocol") + { + if (name == "balance") + { + balance_p_.pre (); + return &balance_p_; + } + else if (name == "withdraw") + { + balance_p_.pre (); + return &withdraw_p_; + } + + cerr << "ignoring unknown request: " << name << endl; + return 0; + } + else + { + // This document is from the wrong namespace. If the runtime and + // the generated code are built with validation enabled then we + // can set an XML Schema error. + // +#ifdef XSDE_PARSER_VALIDATION + context_.schema_error ( + xml_schema::parser_schema_error::unexpected_element); +#endif + return 0; + } + } + + // This function is called to indicate the completion of document + // parsing. The parser argument contains the pointer returned by + // start_root_element. + // + virtual void + end_root_element (const ro_string& /* ns */, + const ro_string& /* name */, + xml_schema::parser_base* parser) + { + // We could have handled the result directly in this function + // instead of storing it in the result_ variable. + // + if (parser == &balance_p_) + { + result_type_ = balance_type; + result_.reset (balance_p_.post_balance ()); + } + else if (parser == &withdraw_p_) + { + result_type_ = withdraw_type; + result_.reset (withdraw_p_.post_withdraw ()); + } + else + { + result_type_ = unknown_type; + result_.reset (0); + } + } + + + public: + // If we need to be able to reset and reuse the parser after + // an error then we also need to override reset() and reset + // the root parsers. We can also get smarter here by caching + // the parser that was used last and only reset that. Note + // that you always need to call _reset() from the base. + // + virtual void + reset () + { + xml_schema::document_pimpl::reset (); + + balance_p_._reset (); + withdraw_p_._reset (); + } + + private: + request_type result_type_; + std::auto_ptr<request> result_; + + balance_pskel& balance_p_; + withdraw_pskel& withdraw_p_; + }; +} + + +int +main (int argc, char* argv[]) +{ + const char* input; + + if (argc < 2) + { + input = "STDIN"; + cerr << "XML file not specified, reading from STDIN" << endl; + } + else + input = argv[1]; + + try + { + using namespace protocol; + + // Construct the parser. + // + xml_schema::unsigned_int_pimpl unsigned_int_p; + + balance_pimpl balance_p; + withdraw_pimpl withdraw_p; + + balance_p.parsers (unsigned_int_p); // account + + withdraw_p.parsers (unsigned_int_p, // account + unsigned_int_p); // amount + + // Parse the XML instance document. + // + document_pimpl doc_p (balance_p, withdraw_p); + + // pre() and post() will be called as part of the start_root_element() + // and end_root_element() calls. + // + if (argc < 2) + doc_p.parse (std::cin); + else + doc_p.parse (argv[1]); + + std::auto_ptr<request> r (doc_p.result ()); + request_type t = doc_p.result_type (); + + // Let's print what we've got. + // + switch (t) + { + case balance_type: + { + balance* b = static_cast<balance*> (r.get ()); + cerr << "balance request for acc# " << b->account () << endl; + break; + } + case withdraw_type: + { + withdraw* w = static_cast<withdraw*> (r.get ()); + cerr << "withdrawal request for acc# " << w->account () << ", " + << "amount: " << w->amount () << endl; + break; + } + case unknown_type: + { + cerr << "unknown request" << endl; + break; + } + } + } + catch (const xml_schema::parser_exception& e) + { + cerr << input << ":" << e.line () << ":" << e.column () << ": " + << e.text () << endl; + return 1; + } + catch (const std::ios_base::failure&) + { + cerr << input << ": unable to open or read failure" << endl; + return 1; + } + + return 0; +} |